Katherine Heigl Slams Costar for Slur

At the Golden Globes on Monday, Katherine Heigl slammed her costar, Isaiah Washington, for using a slur about fellow cast member T.R. Knight, who confirmed exclusively to PEOPLE in October that he is gay.

At issue was a statement Washington made in the Golden Globes press room when he was asked about an alleged on-set incident between himself and Knight. "No, I did not call T.R. a faggot," he said, according to Access Hollywood. "Never happened, never happened."

Heigl, who is close friends with Knight, criticized Washington's statement. "I'm going to be really honest right now, he needs to just not speak in public. Period," she told Access Hollywood's Shaun Robinson. "I'm sorry, that did not need to be said, I'm not okay with it." (Watch Heigl on Access Hollywood here.)

Asked if Knight's feelings were hurt by the comment, she said: "I don't see how you could not be under those circumstances."

Heigl said she hoped the cast would work through the incident like a family. "I just feel like this is something that should be very much in house we need to deal with."

Still, she made it clear that she would stand up for Knight anytime. "T.R. is my best friend. I will throw down for that kid."

After the comments in the press room, Washington continued to address questions about the alleged on-set incident, telling Access: "There is no way I could do anything so vile, and so horrible, not only to a castmate, but to a fellow human being."

He also said that he has completely made up with fellow costar Patrick Dempsey after the two had a scuffle in October.

"I kiss Patrick Dempsey," said Washington. "We sing 'Ebony and Ivory' every day since the so-called incident and it hasn't come up."